US4033111A - Electronic watch having antimagnetic characteristic - Google Patents

Electronic watch having antimagnetic characteristic Download PDF

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Publication number
US4033111A
US4033111A US05/642,336 US64233675A US4033111A US 4033111 A US4033111 A US 4033111A US 64233675 A US64233675 A US 64233675A US 4033111 A US4033111 A US 4033111A
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US
United States
Prior art keywords
watch
plate
transducer
bridge structure
major surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/642,336
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English (en)
Inventor
Eiichi Matsuura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Instruments Inc filed Critical Seiko Instruments Inc
Application granted granted Critical
Publication of US4033111A publication Critical patent/US4033111A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B43/00—Protecting clockworks by shields or other means against external influences, e.g. magnetic fields

Definitions

  • This invention relates to an electronic watch powered by a battery, and more particularly to a battery-powerd electronic watch having an antimagnetic characteristic where a watch movement is prevented from magnetizing by means of magnetic shield members which are made of an antimagnetic material and disposed within the watch movement.
  • the present invention aims to overcome above-mentioned drawbacks and to provide a small-sized antimagnetic watch powered by a battery where watch hands and the movement precisely operate without magnetizing by means of a magnetic shield member disposed within the watch movement.
  • An object of the present invention is to provide an electronic watch including an electromechanical transducer driven by receiving a precise time standard signal where the electromechanical transducer is prevented from magnetization under the influence of magnetic field outside of the watch by means of a magnetic shield member made of an antimagnetic material, so that watch hands are prevented from stopping or incorrectly operating.
  • Another object of the invention is to provide a small-sized electronic watch having an antimagnetic characteristic where the magnetic shield member is disposed in a watch movement.
  • Further object of the invention is to provide an antimagnetic watch in a small size in which the magnetic shield member is secured to the watch movement by means of a screw or an adhesive, whereby assembling of the watch movement having the shield member into a watch case or disassembling said watch movement from the watch case becomes easy.
  • FIG. 1 is a plane view showing an embodiment of an antimagnetic watch according to present invention
  • FIG. 2 is a sectional view taken on line II--II in FIG. 1;
  • FIG. 3 is a sectional view taken on line III--III in FIG. 1;
  • FIG. 4 is a sectional view of another embodiment of the present invention where a bridge is combined with a magnetic shield means in FIG. 1;
  • FIG. 5 is a sectional view of another embodiment where the watch movement of the present invention is held by a case ring made of an antimagnetic material for serving as a magnetization resistant means.
  • FIG. 1 showing a plane view of the electronic watch according to the present invention and FIG. 2 showing a sectional view taken on line II--II in FIG.
  • 1 is a base plate of a watch movement
  • 2 is an electromechanical transducer which is driven by an electric pulse for acting as a step motor.
  • 3 is a driving coil
  • 4 a magnetic core
  • 5 a stator of the electromechanical transducer 2.
  • 6 is a bridge for supporting a rotor shaft of a rotor surrounded by the stator.
  • 7 is a circuit board mounted to the watch movement by means of a screw.
  • 8A and 8B are an upper and a lower magnetic shield members which together comprise shielding means for shielding the transducer 2 from magnetic fields external to the watch, and which are disposed so as to cover upper and lower surfaces of the electromechanical transducer 2.
  • the magnetic shield members are respectively fixed to a step portion 6A of the bridge 6 and to a recess 1a of the base plate 1 by means of the screw or an adhesive within the watch movement.
  • the upper magnetic shield member 8A is provided at both ends with bent portions 8C in order to increase the effect of magnetic shield.
  • the each bent portion 8C of the upper magnetic shield member 8A serves to shield corresponding side portion of the electromechanical transducer 2 from magnetizing by partially peripherally surrounding the same, so that a magnetic line of force passing through the electromechanical transducer is remarkably decreased.
  • the upper magnetic shield member 8A is combined with the bridge 6 so as to be formed as one body and is made of a high antimagnetic material, for example, a permalloy or a supermalloy.
  • a high antimagnetic material for example, a permalloy or a supermalloy.
  • case ring 10 is also made of the antimagnetic material to increase the effect of a magnetization resistance.
  • the case ring 10 serves to hold the watch movement in which said magnetic shield members are disposed for shielding the electromechanical transducer.
  • the effect of the magnetic shield is further increased.
  • the present invention it is possible to obtain the small-sized electronic watch having antimagnetic characteristic since the magnetic shield members disposed within the watch movement shield the watch movement from the magnetization under the influence of the magnetic field outside of the watch. Further, the hands of the watch including the present invention correctly operate without stopping or an incorrrect indication of a time.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
US05/642,336 1974-12-23 1975-12-19 Electronic watch having antimagnetic characteristic Expired - Lifetime US4033111A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP50002640A JPS5174663A (en]) 1974-12-23 1974-12-23
JA502640[U] 1974-12-23

Publications (1)

Publication Number Publication Date
US4033111A true US4033111A (en) 1977-07-05

Family

ID=11534962

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/642,336 Expired - Lifetime US4033111A (en) 1974-12-23 1975-12-19 Electronic watch having antimagnetic characteristic

Country Status (4)

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US (1) US4033111A (en])
JP (1) JPS5174663A (en])
GB (1) GB1497898A (en])
HK (1) HK25882A (en])

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4117665A (en) * 1975-12-26 1978-10-03 Kabushiki Kaisha Daini Seikosha Magnetic shield plate mounting structure for an electronic timepiece
US4165604A (en) * 1976-06-08 1979-08-28 Citizen Watch Co., Ltd. Solar battery timepiece
US4205247A (en) * 1978-03-15 1980-05-27 General Electric Company Prime mover and methods
US4274153A (en) * 1976-04-30 1981-06-16 Citizen Watch Company Limited Movement construction for electronic timepiece
US4276629A (en) * 1976-06-08 1981-06-30 Citizen Watch Company Limited Solar battery timepiece
US4315363A (en) * 1978-03-15 1982-02-16 General Electric Company Method of making and securing a leakage flux conducting device
US4317188A (en) * 1977-02-17 1982-02-23 Kabushiki Kaisha Suwa Seikosha Magnetic shielding plate for a step motor in an electronic wristwatch
US4897825A (en) * 1988-04-05 1990-01-30 Seiko Instruments Inc. Magnetic shielding structure of analog electronic timepiece
US5226020A (en) * 1991-08-17 1993-07-06 Shanghai Chunlei Watch Company Wrist watch having the function of magnetic health care
US6522498B1 (en) 1999-11-22 2003-02-18 Seagate Technology Llc Magnetic shield for flux leakage reduction from spindle motor
US20030206498A1 (en) * 2002-05-03 2003-11-06 John Hardy Clock assembly having an adjustable configuration
US20040042349A1 (en) * 2001-02-28 2004-03-04 Frederic Leuba Use of a non-magnetic coating to cover parts in a watch movement
US20070070818A1 (en) * 2005-09-27 2007-03-29 Casio Computer Co., Ltd. Timepiece apparatus
US20120170426A1 (en) * 2010-12-29 2012-07-05 Keishi Honmura Analogue electronic timepiece
US20170068220A1 (en) * 2015-09-07 2017-03-09 Casio Computer Co., Ltd. Electronic timepiece

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US849292A (en) * 1905-01-04 1907-04-02 Ashbel T Wall Antimagnetic device for watches.
US1247470A (en) * 1916-06-12 1917-11-20 Eugene T Turney Non-magnetizable watch.
US1377229A (en) * 1917-07-25 1921-05-10 Tanner Engineering Company Inc Dynamo-field regulator
US2579318A (en) * 1950-12-28 1951-12-18 Gen Electric Rotor for dynamoelectric machine
US3528703A (en) * 1967-07-11 1970-09-15 Toyota Motor Co Ltd Headrest for vehicle seats

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US849292A (en) * 1905-01-04 1907-04-02 Ashbel T Wall Antimagnetic device for watches.
US1247470A (en) * 1916-06-12 1917-11-20 Eugene T Turney Non-magnetizable watch.
US1377229A (en) * 1917-07-25 1921-05-10 Tanner Engineering Company Inc Dynamo-field regulator
US2579318A (en) * 1950-12-28 1951-12-18 Gen Electric Rotor for dynamoelectric machine
US3528703A (en) * 1967-07-11 1970-09-15 Toyota Motor Co Ltd Headrest for vehicle seats

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Motor Shields, Data Sheet No. 139, Magnetic Shield Division, Perfection Mica Co., 1322 N. Elston Ave., Chicago 22, Ill., May 5, 1958, (cl. 310-85). *

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4117665A (en) * 1975-12-26 1978-10-03 Kabushiki Kaisha Daini Seikosha Magnetic shield plate mounting structure for an electronic timepiece
US4274153A (en) * 1976-04-30 1981-06-16 Citizen Watch Company Limited Movement construction for electronic timepiece
US4165604A (en) * 1976-06-08 1979-08-28 Citizen Watch Co., Ltd. Solar battery timepiece
US4276629A (en) * 1976-06-08 1981-06-30 Citizen Watch Company Limited Solar battery timepiece
US4317188A (en) * 1977-02-17 1982-02-23 Kabushiki Kaisha Suwa Seikosha Magnetic shielding plate for a step motor in an electronic wristwatch
US4205247A (en) * 1978-03-15 1980-05-27 General Electric Company Prime mover and methods
US4315363A (en) * 1978-03-15 1982-02-16 General Electric Company Method of making and securing a leakage flux conducting device
US4897825A (en) * 1988-04-05 1990-01-30 Seiko Instruments Inc. Magnetic shielding structure of analog electronic timepiece
US5226020A (en) * 1991-08-17 1993-07-06 Shanghai Chunlei Watch Company Wrist watch having the function of magnetic health care
US6522498B1 (en) 1999-11-22 2003-02-18 Seagate Technology Llc Magnetic shield for flux leakage reduction from spindle motor
US20040042349A1 (en) * 2001-02-28 2004-03-04 Frederic Leuba Use of a non-magnetic coating to cover parts in a watch movement
US20030206498A1 (en) * 2002-05-03 2003-11-06 John Hardy Clock assembly having an adjustable configuration
US6942379B2 (en) * 2002-05-03 2005-09-13 John Hardy Clock assembly having an adjustable configuration
US20070070818A1 (en) * 2005-09-27 2007-03-29 Casio Computer Co., Ltd. Timepiece apparatus
US20120170426A1 (en) * 2010-12-29 2012-07-05 Keishi Honmura Analogue electronic timepiece
US20170068220A1 (en) * 2015-09-07 2017-03-09 Casio Computer Co., Ltd. Electronic timepiece
CN106502087A (zh) * 2015-09-07 2017-03-15 卡西欧计算机株式会社 电子表
US10180660B2 (en) * 2015-09-07 2019-01-15 Casio Computer Co., Ltd. Electronic timepiece
CN106502087B (zh) * 2015-09-07 2019-08-02 卡西欧计算机株式会社 电子表

Also Published As

Publication number Publication date
HK25882A (en) 1982-06-24
JPS5174663A (en]) 1976-06-28
GB1497898A (en) 1978-01-12

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